1. Arkhipova, I. R. & Meselson, M. 2000. Transposable elements in sexual and ancient asexual taxa. Proc. Natl. Acad. Sci. USA, 97:14473â14477.
2. Ayling, A. L. 1980. Patterns of sexuality, asexual reproduction and recruitment in some subtidal marine Demospongiae. Biol. Bull., 158:271â282.
3. Carr, M. , Nelson, M. , Leadbeater, B. S. C. & Baldauf, S. L. 2008b. Three families of LTR retrotransposons are present in the genome of the choanoflagellate Monosiga brevicollis. Protist, 159:579â590.
4. Carr, M. , Leadbeater, B. S. C. , Hassan, R. , Nelson, M. & Baldauf, S. L. 2008a. Molecular phylogeny of choanoflagellates, the sister group to Metazoa. Proc. Natl. Acad. Sci. USA, 105:16641â16646.
5. Cavalier-Smith, T. 2002. Origins of the machinery of recombination and sex. Heredity, 88:125â141.